.small {
    box-sizing: border-box;
    width: 350px;
    height: 350px;
    border: 1px solid #ccc;
    float: left;
    position: relative;
}

.smallpic {
    width: 348px;
    height: 348px;
}

.big {
    /* box-sizing: border-box; */
    float: left;
    width: 500px;
    height: 500px;
    border: 1px solid #ccc;
    margin-left: 10px;
    display: none;
    position: relative;
    overflow: hidden;
    z-index: 10;
}

.bigpic {
    width: 1000px;
    height: 1000px;
    position: absolute;
    top: 0;
    left: 0;
}

.movebox {
    background-color: rgba(255, 255, 0, .3);
    position: absolute;
    left: 0;
    top: 0;
    display: none;
    cursor: move;
}

.show {
    display: block;
}

.hide {
    display: none;
}